Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Power - Tetrode (NOT beam) (over 1000V 100W) ·Tetrode

8973

Very-high-power transmitting tetrode designed for broadcast and long-range communications RF power service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
18.5 V / 650 A

Description

The EIMAC 8973 is a water-cooled ceramic/metal very-high-power tetrode for mf/hf broadcast and vlf communication service.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
-
Nominal heater voltage
18.5 V
Nominal heater current
650 A
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Tetrode

X-ray radiationInterelectrode capacitances
Amplification factor
4.5
Max plate voltage
22500 V
Max screen voltage
2500 V
Max plate dissipation
650000 W
Max screen dissipation
7500 W
Max grid dissipation
2000 W
Max cathode current
65 A

Promoted from printed general-characteristics and absolute-maximum-ratings blocks.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1962 Eimac

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristic

  • Amplification factor

    4.5

Other

  • Maximum DC plate voltage

    22500 V

  • Maximum DC screen voltage

    2500 V

  • Maximum plate dissipation

    650000 W

  • Maximum screen dissipation

    7500 W

  • Maximum grid dissipation

    2000 W

  • Maximum cathode/plate current

    65 A